Boring unit



March 24,1925. 1,531, 9

I H. A. PEDRICK BORING UNIT Sheets-Sheet 2 Filed June 23, 1921 Fly. 5.

March 24. 1925.

H. A. PEDRICK BORING UNIT 3 Sheets-Sheet 5 Filed June 23, 1921 54 f g E1rd.

shall include v meat of feed nut'for cooperating with Patented Mar. 24,.1925.

UNITED; STATES, v

1,531,129 PATENT OFFICE.

HOW'ARD A. EEDR-ICK, OF BALA, PENNSYLVANIA, ASSIGNGR TO HIMSELF ANDALBERT ID, PEDRICK, COPARTNEEES TRADING AS PEDRICK TOOL AND IMAGHINECCv'liIPANY.

BORING UNIT.

Applicationfiled June 23, 192-1. Serial-No. 479,837.

To (/ZZ whom it may concern.

Be it known that I, Howann A. PEDRICK, a citizen of the United States,residing in Bala, Montgomery County, Pennsylvania, have invented theBoring Unit, of which the following is a specification.

This invention relates to that class of devices particularly designedfor boring the interiors of cylindrical structures as well as fordrilling, reaming and similar operations and one object thereof is toprovide a novel structure for adjustablysupporting a power driven boringbar, whereby this iiuay be quickly and conveniently mounted on oradjacent the structure to be operated on, in such position as to performthe work required. g

It is further desired to provide a boring bar with a supportingstructure particularly adapted to serve as a means forlcarrying thegearing or other driving mechanism or device for actuating said bar, andthe arrangement of parts is such as to'permit of thecuiclc andconvenient adjustment of saidn'ieehanisln on the supporting structure inorder to best suit it for connection to the drivingmotor, shaft, orother device by or thr gh which power is supplied.

rinother object of my invention is to provide a deviee'of the characternoted'which novel construction and arran the feed screw which controlsthe feed or longitudinal movement of the boring bar,

the arrangement being such as to permit of th convenient and quickadjustment of said nut for the purpose of free ng 1t at will from thesaid screw 1n order topermlt of ing bar either by hand or otherwise.These OlOJGCtS and other advantageous ends I attain as herelnafter setforth, reference being had to the accompanying draw ings, in which,

Figsv 1 andQ are respectively a plan and.

pulley is transmitted to the boring bar, prefa side elevation of aboring machine or unit constructed in accordance wlth w my invention:

' pair of supporting feet each in the form Fin. 3 is alougitudinalsection on the line .L. 5 and 6 are transverse vertical of acasting having two portions 2 and ,3 formed with plane external facesand extending at right angles to each other. These two portions aresuitably braced by a web 41 and are respectively formed with elongatedbolt holes or slots 5 and 6. The first set of these slots, towit,-tl1ose in the portion 2 of each foot, are designed for thereception of suitable bolts whereby my device may be rapidly, thoughadjustably, connected to or mounted upon a suitable support or objectsuch as the head of a cylinder to be bored. and the slots of theportions 3 are similarly designed to adjustably receive bolts 7 formedwith heads slidably mounted in undercut recesses or grooves formed inthe opposite sides of a hollow bodyv struc-' ture S. I

Said. body 8 is preferably, though not necessarily, substantiallyrectangular in' cross section and has its ends or heads formed toprovide aligned and relatively elongated bearings for a boring bar 9,which is free to turn as well as slide longitudinally through them.These bearings include suitable bushings of bronze or other bearingmaterial, and one of. them is extended as indicated at 10 beyond theouter face of the body for the reception of a plate 11 rotate ablymounted upon it, so as to be adjustable about or capable of swingingaxially of the boring bar. This plate may be clamped in any givenposition on said bearing extension 10 by means of a set screw or bolt 12threaded through it radially of theboring 13as indicated in Figs. 3 and5.

The supporting plate ll through suitable means, such as screws 14, isconnected to an bar and designed to engage a clamping plate ;openfra1ne16 serving to support or carry -a driving pulley 17, suitable spindles,and

a train of gears 1821, of which the first is connected to the shaftcarrying said pulley and the last is splined to the boring bar 9. Bythisineans power applied-to the driving erablythrough the speed-reducinggearing shown, regardless of the position of said bar relatively to thesupporting structure 1 and also regardless of thelposition of thefranie'lii and the plate 11 on the bearing eX- tension 10.

VVithin thebody 8, between the two ends 'or heads'thereof, is mountedthe'device for longitudinally feeding thelboring bar when it rotated.This, in the present instance, consists of a substantially cylindricalsleeve 22 mounted on and substantially concentric with said bar havingthrust rings 2328 be- Lween its ends and the two bearing portions orheads of the body 8. This sleeve is formed I pre'l'erablyj although notnecessarily,

provide a devicewhereby the feed nut may be moved at will into and outof operative engagement wi l the teed screw and for this iiurposeprovide a cap 26 mounted on the sleeve over the slot for the feed nut,having threaded through it a bolt 27 whose head is connected to saidnut. The construction is such that whi e said bolt may be rotated tocause it to move longituoinally torard and from the feed screw, its headr0- atahlv engages the nut, so that this is moved radially ot said screwinto or out of enement with the same.

In addition to the above described parts.-

suitable mechanism is providedwhereby at will the feed screw 25 may berotated or held from rotation independently ot the boring bar and. itsspeed and direction of rotation varied. but inasmuch as the detailconstruction of mechanism forms no part of the present invention. l havenot described it iii-detail.

Under operating conditions a tool-carrying chuck is-mounted in a su'able recess in the boring bar, or a cutter may be otheim'ise mountedthereon, and the sup porting structure is mounted adjacent or attachedto the object which it is desired to bore or drillytor which purposesuitable bolts are placed in the slots 2 of the legs 1. The body 8 withits attached parts is then moved .to bring" the boring bar into thedesired position, utter which the bolts 7 are set up so that said partsare retained inplace.

The frame 11l6 with the driving train is then swung; about the bearingextension 10 ofthe body 8 into such a position that the beltfrom asource of power such as a driving shaft or electric motor, will properlyengage the driving pu ley 17 with the desired tension. Thereafter thebolt 12 is set up so that said frame ll-16 is retained in place and itis noted that the gear 21 is preferably formed with extended hubs onwhich the frame 16 is mounted to turn.;lil;e;the plate 311,concentrically with the boringbart).

ll now-the boring bar be moved longitu' dinally to bring its cutter intoposition to ope ate on a cylinder or other ob ect, power may be appliedto the driving pulley so that through the train of gears lS2l. the

boring bar is rotated at the desired speed. Obviously the sleeve 22 andfeed nut 2 t are rotated with the boring bar, together with the feedscrew 25 carried by the latter. By means of the mechanism 29 said teedscrew may be caused to rotate in either direction relatively to theboring bar. so that the latter by reason of the cooperation of saidscrew and the feed nut, is caused to move longitudinally and its cutterthereby made to operate as required.

If it be desired to quickly move the heringbar with its cutterlongitudinally into or out of operative position, the bolt 2? may bebacked ofi', thereby raising; the feed nut 2- out of engagement with the"feed screw, whereupon the boring bar 9 may he slid by hand through thebody 8, sleeve and driving mechanism. Therez-it'ter by screwing downsaid bolt. the feed nut 2-!- may be again brought into, operativeengagement with the feed screw.

From the above description it will be noted that not only may the devicebe mounted in any desired position relatively to the structure to beoperated on. but it may be quickly and conveniently adjusted forconnection with a source of power and that in such manner as to maintaina driving belt at the necessary tension regardless of the relativeposition of said power s-tuirce. The apparatus as a whole constitutes aconveniently portable. relatively inexpensive and convenientlyadjust-able device which is not only of a relatively simple and compactconstruction but is of such a nature as to permit of its being: made insubstantial and durable form. suitingit for work on objects of widelyvarying form and construction.

I claim:

The combination in a boring unit. of a rectangular, hollow bodystructure: a pair of supporting feet on each side of. the saidstructure; means for adjustablv securing the body structure to the saidfeet: upper and lower bearings in the body structure: a boring barmounted in the bearings; a feed screw carried by the boring bar; a nutmounted between the hearings ot th body structure; means tor moving thenot into and out of engagement with. the teed screw; a plate pivotallymounted on the upper bearing: means for securing the plate in position;a frame mounted on the plate and carrying the driving mechanism for theboring bar; and means at the upper endot the boring bar for turning; thefeed screw to move the boring bar lone'itudinally.

" HOl VARD A. PEDRICK.

